45 Questions
What is the purpose of an electric shock risk assessment?
To identify electric shock hazards and estimate the likelihood and severity of injury or damage to health
What factors should be considered when estimating the likelihood and severity of injury from electric shock?
The design of the electrical equipment and its operating condition
When additional protective measures are required, what should be determined if the use of PPE is included?
The voltage to which personnel will be exposed and the boundary requirements
What is a requirement after performing an electric shock risk assessment?
The results of the assessment shall be documented
What information must be included on a label for electrical equipment in other than dwelling units?
Nominal system voltage, arc flash boundary, and incident energy or arc flash PPE category
Under what conditions can labels applied prior to the effective date of the standard be acceptable?
If they complied with the requirements for equipment labeling in the standard at the time of application
In supervised industrial installations, how often should the data supporting the information on the label be reviewed for accuracy?
At intervals not to exceed 5 years
Who is responsible for the documentation, installation, and maintenance of the marked label for electrical equipment?
The owner of the electrical equipment
What information is permitted to be documented in a supervised industrial installation where only qualified persons monitor and service the system?
Information required in 130.5(H)(1) through 130.5(H)(3)
What is the exception for changes in electrical distribution systems rendering the label inaccurate?
Labels are acceptable if they complied with the requirements for equipment labeling at the time of application
What documentation is required for the method of calculating incident energy and the data supporting the label information?
The method of calculating incident energy and the data supporting the label information shall be documented
What should the label for electrical equipment be of, to withstand the environment involved?
Sufficient durability
What are the two types of approach boundaries for electric shock protection?
Limited approach boundary and restricted approach boundary
When can unqualified persons approach energized conductors closer than the limited approach boundary?
They are prohibited from doing so
Under what conditions can qualified persons approach closer than the restricted approach boundary to energized conductors?
When specific conditions are met
What is required to identify hazards, estimate likelihood and severity of injury, and determine necessary protective measures related to arc flash?
Arc flash risk assessment
What is considered in the likelihood and severity assessment for arc flash risk?
Equipment design, overcurrent protective device, and operating condition
How must additional protective measures, including PPE, be selected and implemented?
According to the hierarchy of risk control
What is the arc flash boundary?
The distance at which incident energy equals 1.2 cal/cm2 (5 J/cm2)
How can arc flash PPE selection be based on?
Incident energy analysis or arc flash PPE category method, but not both
When should incident energy analysis be updated?
When system changes occur
An electric shock risk assessment is not required to identify electric shock hazards, estimate the likelihood of occurrence of injury or damage to health, and determine if additional protective measures are required.
False
The estimate of likelihood of occurrence of injury or damage to health and the potential severity of injury or damage to health does not need to take into consideration the design and operating condition of the electrical equipment.
False
When additional protective measures are required, they do not need to be selected and implemented according to the hierarchy of risk control identified in 110.3(H)(3).
False
The results of the electric shock risk assessment are not required to be documented.
False
Electrical equipment in other than dwelling units that are likely to require examination, adjustment, servicing, or maintenance while energized must be marked with a label containing the nominal system voltage, arc flash boundary, and at least one of the following: available incident energy and corresponding working distance, or the arc flash PPE category, or minimum arc rating of clothing, or site-specific level of PPE.
True
Labels applied prior to the effective date of the standard will be acceptable if they complied with the requirements for equipment labeling in the standard in effect at the time the labels were applied.
True
In supervised industrial installations, the information required for the label may be documented in a manner that is readily available to persons likely to perform examination, servicing, maintenance, and operation of the equipment while energized.
True
The data supporting the information on the label for electrical equipment must be reviewed for accuracy at intervals not to exceed 5 years.
True
The arc flash PPE selection can be based on the available incident energy and the corresponding working distance, or the arc flash PPE category, or the minimum arc rating of clothing, or the site-specific level of PPE.
True
Unqualified persons can approach energized conductors closer than the limited approach boundary in supervised industrial installations where only qualified persons monitor and service the system.
False
The owner of the electrical equipment is not responsible for the documentation, installation, and maintenance of the marked label.
False
Changes in electrical distribution systems rendering the label inaccurate are not acceptable as exceptions.
False
Unqualified persons are allowed to approach energized conductors closer than the limited approach boundary
False
Qualified persons can approach closer than the restricted approach boundary to energized conductors under specific conditions
True
Arc flash risk assessment is not required to identify hazards related to arc flash incidents
False
Likelihood and severity assessment for arc flash risk considers equipment design, overcurrent protective device, and operating condition
True
Arc flash PPE selection can only be based on incident energy analysis
False
The arc flash boundary is the distance at which incident energy equals 1.2 cal/cm2 (5 J/cm2) and does not need to be documented
False
Incident energy analysis should be based on the working distance from the arc source and must be updated when system changes occur
True
Alerting methods in 130.8(O) must be used when unqualified persons work near the restricted approach boundary
False
Unqualified persons can cross the limited approach boundary under continuous escort by a qualified person
True
Qualified persons are prohibited from approaching closer than the limited approach boundary to energized conductors
False
Additional protective measures, including PPE, must be selected and implemented according to the hierarchy of risk control
True
The arc flash PPE selection can be based on incident energy analysis and arc flash PPE category method at the same time
False
Study Notes
Electrical Safety Standards Summary
- Electric shock protection boundaries include limited approach boundary and restricted approach boundary
- Table 130.4(E)(a) provides distances for various AC system voltages, and Table 130.4(E)(b) for various DC system voltages
- Unqualified persons are prohibited from approaching energized conductors closer than the limited approach boundary
- Alerting methods in 130.8(O) must be used when unqualified persons work near the limited approach boundary
- Unqualified persons can only cross the limited approach boundary under continuous escort by a qualified person
- Qualified persons are prohibited from approaching closer than the restricted approach boundary to energized conductors, unless specific conditions are met
- Arc flash risk assessment is required to identify hazards, estimate likelihood and severity of injury, and determine necessary protective measures
- Likelihood and severity assessment considers equipment design, overcurrent protective device, and operating condition
- Additional protective measures, including PPE, must be selected and implemented according to the hierarchy of risk control
- The arc flash boundary is the distance at which incident energy equals 1.2 cal/cm2 (5 J/cm2) and must be documented
- Arc flash PPE selection can be based on incident energy analysis or arc flash PPE category method, but not both
- Incident energy analysis should be based on the working distance from the arc source, and must be updated when system changes occur
Electrical Safety Standards Summary
- Electric shock protection boundaries include limited approach boundary and restricted approach boundary
- Table 130.4(E)(a) provides distances for various AC system voltages, and Table 130.4(E)(b) for various DC system voltages
- Unqualified persons are prohibited from approaching energized conductors closer than the limited approach boundary
- Alerting methods in 130.8(O) must be used when unqualified persons work near the limited approach boundary
- Unqualified persons can only cross the limited approach boundary under continuous escort by a qualified person
- Qualified persons are prohibited from approaching closer than the restricted approach boundary to energized conductors, unless specific conditions are met
- Arc flash risk assessment is required to identify hazards, estimate likelihood and severity of injury, and determine necessary protective measures
- Likelihood and severity assessment considers equipment design, overcurrent protective device, and operating condition
- Additional protective measures, including PPE, must be selected and implemented according to the hierarchy of risk control
- The arc flash boundary is the distance at which incident energy equals 1.2 cal/cm2 (5 J/cm2) and must be documented
- Arc flash PPE selection can be based on incident energy analysis or arc flash PPE category method, but not both
- Incident energy analysis should be based on the working distance from the arc source, and must be updated when system changes occur
Test your knowledge of electrical safety standards with this summary quiz. Covering topics such as electric shock protection boundaries, alerting methods, arc flash risk assessment, and PPE selection, this quiz will help you reinforce your understanding of key safety measures in electrical work.
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